1,3

David W. Wilson: the list is complete. Proof: One shows that the number of digits is at most 84 and then it is only necessary to consider numbers of the forms 2^i*3^j*7^k and 3^i*5^j*7^k.

Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.

Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.

144 belongs to the sequence because 1*4*4=16, 1+4+4=9 -> 16*9=144

n = A007953(n) * A007954(n).

Cf. A066282.

Sequence in context: A050963 A051387 A007251 this_sequence A066282 A066176 A025363

Adjacent sequences: A038366 A038367 A038368 this_sequence A038370 A038371 A038372

nice,nonn,fini,base,full,bref

Felice Russo (felice.russo(AT)katamail.com)